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Abstract: 30 CFR part 18 (Electric Motor-Driven Mine Equipment and Accessories) describes the approval requirements for electrically operated machines and accessories intended for use in underground gassy mines, and for related matters, such as approval procedures, certification of components, and acceptance of flame-resistant hoses and conveyor belts. Aside from minor modifications, part 18 has been largely unchanged since it was promulgated in 1968. MSHA is proposing revisions to improve the efficiency of the approval process, recognize new technology, add quality assurance provisions, address existing policies through the rulemaking process, and reorganize portions of the approval regulations. MSHA will be addressing the requirements in this NPRM in phases. The first phase, Flame-Resistance Testing of Mining Materials, was completed with the final rule published on December 31, 2008 (73 FR 80580). The second phase will be Intrinsic Safety Requirements. This action will be published second because the MINER Act requires underground coal mine operators to submit an Emergency Response Plan (ERP) that sets forth a means of providing post-accident communication and electronic tracking by June 15, 2009.